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Pearl · 2025年02月12日

illiquid fixed income bond的bid ask spread为什么更大?

NO.PZ2023032703000004

问题如下:

Danny Moynahan, CFA, is a fixed-income portfolio manager at Reagan Investment Advisory (Reagan). He agrees with his wife, a professor of investments class, to talk to her class about managing fixed-income portfolios. He plans to put together six pages for his discussion.

Moynahan titles page 3, “Liquidity in the Fixed-Income Market.” He wants to ensure that the class appreciates the differences in liquidity between fixed-income and equity securities. He stresses that liquidity across fixed-income securities varies greatly and that compared to equities, fixed-income markets are generally less liquid. Also, liquidity influences fixed-income pricing, but illiquidity enhances the portfolio’s yield to maturity. Lastly, dealers will narrow bid–ask spreads on thinly traded securities as a consequence of their illiquidity.

Are Moynahan’s comments regarding fixed-income liquidity most likely correct?

选项:

A.

Yes.

B.

No, with respect to fixed-income pricing and yield to maturity.

C.

No, with respect to the bid–ask spread.

解释:

C is correct. Moynahan’s comment on the bid–ask spread of thinly traded securities is incorrect. Dealers widen bid–ask spreads for thinly traded securities to reflect their illiquidity.

A is incorrect because Moynahan’s comment regarding fixed-income trading and narrowly traded securities is incorrect.

B is incorrect because the comment regarding fixed-income pricing and yield to maturity is correct.

关于选项C,为啥说spread大 反映illiquid?

1 个答案

发亮_品职助教 · 2025年02月12日

bid-ask spread会反应资产的流动性,不仅债券,其他资产也是一样。


bid-ask spread大的,说明流动性差illiquid,反之,bid-ask spread小的,说明流动性很好。


原因是bid-ask spread是做市商dealer报的做市价。他们以bid price把资产从市场上买过去,再以ask price把资产卖出去。做市商dealer赚的就是(ask price - bid price)的价差。


如果这个资产的流动性差,风险高,做市商在中间承担的风险就大,因为有可能做市商买入这个资产后,很长一段时间都没有卖出去,他们承担了其中流动性差的风险。所以,为了补偿dealer承担的风险,他们要求的bid-ask spread就大一点。


于是从bid-ask spread里可以看出资产的流动性好坏。越是流动性好的资产,做市商dealer承担的风险越小,要求的bid-ask spread越小。

反之,越是流动性差的资产,要求的bid-ask spread就越大。

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